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122 changes: 122 additions & 0 deletions
122
src/hello_imgui/internal/backend_impls/rendering_metal_glfw.mm
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| #ifdef HELLOIMGUI_HAS_METAL | ||
| #ifdef HELLOIMGUI_USE_GLFW3 | ||
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| #include "rendering_metal.h" | ||
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| #import <Metal/Metal.h> | ||
| #import <QuartzCore/QuartzCore.h> | ||
| #include <backends/imgui_impl_metal.h> | ||
| #include <array> | ||
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| #include "hello_imgui/hello_imgui.h" | ||
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| #define GLFW_INCLUDE_NONE | ||
| #define GLFW_EXPOSE_NATIVE_COCOA | ||
| #include <GLFW/glfw3.h> | ||
| #include <GLFW/glfw3native.h> | ||
| #include <backends/imgui_impl_glfw.h> | ||
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| namespace HelloImGui | ||
| { | ||
| GlfwMetalGlobals gGlfwMetalGlobals; | ||
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| void PrepareGlfwForMetal_WithWindow_PreImGuiInit(GLFWwindow* glfwWindow) | ||
| { | ||
| gGlfwMetalGlobals.glfwWindow = glfwWindow; | ||
| // gGlfwMetalGlobals.sdlRenderer = SDL_CreateRenderer(sdlWindow, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC); | ||
| // if (gGlfwMetalGlobals.sdlRenderer == nullptr) | ||
| // { | ||
| // bool Error_SdlCreateRenderer_For_Metal = false; | ||
| // IM_ASSERT(Error_SdlCreateRenderer_For_Metal); | ||
| // exit(-3); | ||
| // } | ||
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| // Setup Platform/Renderer backends | ||
| // gGlfwMetalGlobals.caMetalLayer = (__bridge CAMetalLayer*)SDL_RenderGetMetalLayer(gGlfwMetalGlobals.sdlRenderer); | ||
| // gGlfwMetalGlobals.caMetalLayer.pixelFormat = MTLPixelFormatBGRA8Unorm; | ||
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| gGlfwMetalGlobals.mtlDevice = MTLCreateSystemDefaultDevice(); | ||
| gGlfwMetalGlobals.mtlCommandQueue = [gGlfwMetalGlobals.mtlDevice newCommandQueue]; | ||
| } | ||
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| void PrepareGlfwForMetal_PosImGuiInit() | ||
| { | ||
| ImGui_ImplGlfw_InitForOther(gGlfwMetalGlobals.glfwWindow, true); | ||
| ImGui_ImplMetal_Init(gGlfwMetalGlobals.mtlDevice); | ||
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| NSWindow *nswin = glfwGetCocoaWindow(gGlfwMetalGlobals.glfwWindow); | ||
| gGlfwMetalGlobals.caMetalLayer = [CAMetalLayer layer]; | ||
| gGlfwMetalGlobals.caMetalLayer.device = gGlfwMetalGlobals.mtlDevice; | ||
| gGlfwMetalGlobals.caMetalLayer.pixelFormat = MTLPixelFormatBGRA8Unorm; | ||
| nswin.contentView.layer = gGlfwMetalGlobals.caMetalLayer; | ||
| nswin.contentView.wantsLayer = YES; | ||
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| gGlfwMetalGlobals.mtlRenderPassDescriptor = [MTLRenderPassDescriptor new]; | ||
| } | ||
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| void SwapGlfwMetalBuffers() | ||
| { | ||
| [gGlfwMetalGlobals.mtlRenderCommandEncoder popDebugGroup]; | ||
| [gGlfwMetalGlobals.mtlRenderCommandEncoder endEncoding]; | ||
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| [gGlfwMetalGlobals.mtlCommandBuffer presentDrawable:gGlfwMetalGlobals.caMetalDrawable]; | ||
| [gGlfwMetalGlobals.mtlCommandBuffer commit]; | ||
| } | ||
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| RenderingCallbacks CreateBackendCallbacks_GlfwMetal() | ||
| { | ||
| RenderingCallbacks callbacks; | ||
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| callbacks.Impl_NewFrame_3D = [] | ||
| { | ||
| auto Vec4_To_Array = [](ImVec4 v) { return std::array<float, 4>{ v.x, v.y, v.z, v.w }; }; | ||
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| int width, height; | ||
| glfwGetFramebufferSize(gGlfwMetalGlobals.glfwWindow, &width, &height); | ||
| gGlfwMetalGlobals.caMetalLayer.drawableSize = CGSizeMake(width, height); | ||
| gGlfwMetalGlobals.caMetalDrawable = [gGlfwMetalGlobals.caMetalLayer nextDrawable]; | ||
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| gGlfwMetalGlobals.mtlCommandBuffer = [gGlfwMetalGlobals.mtlCommandQueue commandBuffer]; | ||
| auto clearColor = Vec4_To_Array(HelloImGui::GetRunnerParams()->imGuiWindowParams.backgroundColor); | ||
| gGlfwMetalGlobals.mtlRenderPassDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(clearColor[0] * clearColor[3], clearColor[1] * clearColor[3], clearColor[2] * clearColor[3], clearColor[3]); | ||
| gGlfwMetalGlobals.mtlRenderPassDescriptor.colorAttachments[0].texture = gGlfwMetalGlobals.caMetalDrawable.texture; | ||
| gGlfwMetalGlobals.mtlRenderPassDescriptor.colorAttachments[0].loadAction = MTLLoadActionClear; | ||
| gGlfwMetalGlobals.mtlRenderPassDescriptor.colorAttachments[0].storeAction = MTLStoreActionStore; | ||
| gGlfwMetalGlobals.mtlRenderCommandEncoder = [ | ||
| gGlfwMetalGlobals.mtlCommandBuffer renderCommandEncoderWithDescriptor:gGlfwMetalGlobals.mtlRenderPassDescriptor]; | ||
| [gGlfwMetalGlobals.mtlRenderCommandEncoder pushDebugGroup:@"ImGui demo"]; | ||
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| // Start the Dear ImGui frame | ||
| ImGui_ImplMetal_NewFrame(gGlfwMetalGlobals.mtlRenderPassDescriptor); | ||
| ImGui_ImplGlfw_NewFrame(); | ||
| }; | ||
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| callbacks.Impl_RenderDrawData_To_3D = [] | ||
| { | ||
| ImGui_ImplMetal_RenderDrawData(ImGui::GetDrawData(), gGlfwMetalGlobals.mtlCommandBuffer, gGlfwMetalGlobals.mtlRenderCommandEncoder); | ||
| }; | ||
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| // Not implemented for Metal | ||
| //callbacks.Impl_ScreenshotRgb = []() { ...;}; | ||
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| // This is done at Impl_NewFrame_3D | ||
| callbacks.Impl_Frame_3D_ClearColor = [](ImVec4 clearColor) { }; | ||
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| callbacks.Impl_Shutdown_3D = [] | ||
| { | ||
| ImGui_ImplMetal_Shutdown(); | ||
| }; | ||
| return callbacks; | ||
| } | ||
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| GlfwMetalGlobals& GetGlfwMetalGlobals() | ||
| { | ||
| return gGlfwMetalGlobals; | ||
| } | ||
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| } // namespace HelloImGui | ||
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| #endif // HELLOIMGUI_USE_GLFW3 | ||
| #endif // HELLOIMGUI_HAS_METAL |
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